Diesel engine



Jan. 8, 1929.

9 3 1,698,161 M. LOUIS DIESEL ENGINE Filed March 1927 MC L ni.

Patented Jan. 8, 1929.

UNITED STATES v PATENT OFFICE.

IAZBTIN' LOUIS, OF KIEL, GERMANY, CASSIGNOR TO FRIED. KRUPPGERMANIAWERFT AKTIENGESELLSCHAF'I OF KIEL-GAARIDEN, GERMANY.

DIESEL ENGINE.

Application. filed Marcht, 1927, Serial No. 174,042, and in GermanyApril 24, 1926.

In Diesel engines which operate with precompressed charging air toincrease theirs efliciency, in the normal operation (withoutpre-compression) the pressure of the compression is chosen to be as lowas possible-as far as this is still possible with respect to a securedignition-in order to not have a too high end pressure of thecompression, when the initial pressure is increased by saidpre-compression. To maintain further the maximum pressure of thecombustion within admissible limits, when pre-compressed air is used, acombustion under constant pressure has to be' aimed at if possible,whilst for the normal service (without pre-compression) and for a lowend pressure of the compression a combustion under a somewhat increasedpressure is to be aimed at, to obtain a good thermodynamic efficiency ofthe machine. As it is known, the course of the pressure arising duringcombustion may be influenced by suitably adjusting the pre-injection ofthe fuel. Now my invention has for its object to afford a means forautomatically regulating, in machines in which the moment of inject-ionis determined by the fuel pump, the extent of the precompression incorrespondence to the pre-injection of the fuel. This object is obtainedaccording to my invention by automatically adjusting the rigging servingto determine the moment of the pre-injecti'on, b means of a controlling'ciprocate in acy'li-nder N. The space a pi; s ton M is connected by apipe 0 .to the pressure piping (not shown) of the pump suppiston whichis un er the action of the precompressed' air.

In order that my invention may be more easily understood, a preferredembodiment of same'is diagrammatically illustrated in the drawing whichaccompanies and forms part of this specification.

Referring to this drawing, A denotes the fuel pumpof the Diesel enginethe piston B of which pump is actuated by a cam disk D through theintermediary of a rod 0. The latter carries rollers on both its ends andis linked on one end by a rod E to a fixed point F, whilst its other'endmaybe swung about a shiftable point H by intermediary of a link G. PointH is formedby one end of an angle lever J adapted to swing about a fixedpoint -K and the other end of which is connected to a, piston M byfalink L. Piston M ma reove provided the shaft R of which serves as anadjustable abutment for piston M.

The described device operates .as follows: When the pressure of thecharging air is increased by pre-compression, the pressure prevailing inthe piping connecting the blower and the machine is transmitted throughpipe 0 to piston M, which is then lowered against the action of spring Puntil the force of the latter and the air pressure above the piston arein equilibrium. The downward motion of piston M causes the point H toswing to the right, as shown by dot and dash lines, through theintermediary of link L and bell crank lever J. Point H carries alongwith it to the right the upper roller of link 0, by means of link G.With the cam disk D rotating in the directionindicated by the arrow,this right-hand motion causes the upper roller of link C to ascend onthe cam of disk D later. Consequently, the motion of the piston B of thefuel pump A, and therefore the supply of fuel and the injection periodcommence later. I

Of course, my invention is not limited to machines with which the entirecombustion air is pre-c ompressed; it may on the contrary, be employedalso with machines with which only that portion of the combustion air ispre-compressed that serves for the supplemental charge.

What I claim and desire ters-Patent, is

In a Diesel engine operated with pre-compressed charging air andpre-injection of the fuel, a fuel pump, a rod adapted to actuate saidpump, a cam disk actuating said rod, a cylinder, a piston adapted toreciprocate therein and being under the pressure of the pre-compressedcharging air, a yielding means adapted to act on said piston against theaction of said air pressure, a rigging connected to said rod and to saidpiston to secure by Letand adapted to adjust said rod with rela- Theforegoing specification signed at Hambung, Germany, this tenth day ofFebruary, 192

. -MABT1N LOUIS.

